Rin , a wife, is filled with doubts and frustration over her husband's frequent business trips and their complete lack of sexual relations. Her father-in-law treats Rin kindly as Kokoro about her husband's suspicions of infidelity. Kokoro lonely, Rin begins to cling to her father-in-law's kindness... Her overwhelming sexual frustration overcomes her forbidden relationship and she turns into a bitch who simply devours pleasure...